ptyfs_vnops.c revision 1.22
1 /* $NetBSD: ptyfs_vnops.c,v 1.22 2007/01/19 20:10:36 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1993, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Jan-Simon Pendry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)procfs_vnops.c 8.18 (Berkeley) 5/21/95 35 */ 36 37 /* 38 * Copyright (c) 1993 Jan-Simon Pendry 39 * 40 * This code is derived from software contributed to Berkeley by 41 * Jan-Simon Pendry. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by the University of 54 * California, Berkeley and its contributors. 55 * 4. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 * 71 * @(#)procfs_vnops.c 8.18 (Berkeley) 5/21/95 72 */ 73 74 /* 75 * ptyfs vnode interface 76 */ 77 78 #include <sys/cdefs.h> 79 __KERNEL_RCSID(0, "$NetBSD: ptyfs_vnops.c,v 1.22 2007/01/19 20:10:36 christos Exp $"); 80 81 #include <sys/param.h> 82 #include <sys/systm.h> 83 #include <sys/time.h> 84 #include <sys/kernel.h> 85 #include <sys/file.h> 86 #include <sys/filedesc.h> 87 #include <sys/proc.h> 88 #include <sys/vnode.h> 89 #include <sys/namei.h> 90 #include <sys/malloc.h> 91 #include <sys/mount.h> 92 #include <sys/select.h> 93 #include <sys/dirent.h> 94 #include <sys/resourcevar.h> 95 #include <sys/stat.h> 96 #include <sys/conf.h> 97 #include <sys/tty.h> 98 #include <sys/pty.h> 99 #include <sys/kauth.h> 100 101 #include <uvm/uvm_extern.h> /* for PAGE_SIZE */ 102 103 #include <machine/reg.h> 104 105 #include <fs/ptyfs/ptyfs.h> 106 #include <miscfs/genfs/genfs.h> 107 #include <miscfs/specfs/specdev.h> 108 109 /* 110 * Vnode Operations. 111 * 112 */ 113 114 int ptyfs_lookup (void *); 115 #define ptyfs_create genfs_eopnotsupp 116 #define ptyfs_mknod genfs_eopnotsupp 117 int ptyfs_open (void *); 118 int ptyfs_close (void *); 119 int ptyfs_access (void *); 120 int ptyfs_getattr (void *); 121 int ptyfs_setattr (void *); 122 int ptyfs_read (void *); 123 int ptyfs_write (void *); 124 #define ptyfs_fcntl genfs_fcntl 125 int ptyfs_ioctl (void *); 126 int ptyfs_poll (void *); 127 int ptyfs_kqfilter (void *); 128 #define ptyfs_revoke genfs_revoke 129 #define ptyfs_mmap genfs_eopnotsupp 130 #define ptyfs_fsync genfs_nullop 131 #define ptyfs_seek genfs_nullop 132 #define ptyfs_remove genfs_eopnotsupp 133 #define ptyfs_link genfs_abortop 134 #define ptyfs_rename genfs_eopnotsupp 135 #define ptyfs_mkdir genfs_eopnotsupp 136 #define ptyfs_rmdir genfs_eopnotsupp 137 #define ptyfs_symlink genfs_abortop 138 int ptyfs_readdir (void *); 139 #define ptyfs_readlink genfs_eopnotsupp 140 #define ptyfs_abortop genfs_abortop 141 int ptyfs_reclaim (void *); 142 #define ptyfs_lock genfs_lock 143 #define ptyfs_unlock genfs_unlock 144 #define ptyfs_bmap genfs_badop 145 #define ptyfs_strategy genfs_badop 146 int ptyfs_print (void *); 147 int ptyfs_pathconf (void *); 148 #define ptyfs_islocked genfs_islocked 149 #define ptyfs_advlock genfs_einval 150 #define ptyfs_bwrite genfs_eopnotsupp 151 #define ptyfs_putpages genfs_null_putpages 152 153 static int ptyfs_update(struct vnode *, const struct timespec *, 154 const struct timespec *, int); 155 static int ptyfs_chown(struct vnode *, uid_t, gid_t, kauth_cred_t, 156 struct lwp *); 157 static int ptyfs_chmod(struct vnode *, mode_t, kauth_cred_t, struct lwp *); 158 static int atoi(const char *, size_t); 159 160 extern const struct cdevsw pts_cdevsw, ptc_cdevsw; 161 162 /* 163 * ptyfs vnode operations. 164 */ 165 int (**ptyfs_vnodeop_p)(void *); 166 const struct vnodeopv_entry_desc ptyfs_vnodeop_entries[] = { 167 { &vop_default_desc, vn_default_error }, 168 { &vop_lookup_desc, ptyfs_lookup }, /* lookup */ 169 { &vop_create_desc, ptyfs_create }, /* create */ 170 { &vop_mknod_desc, ptyfs_mknod }, /* mknod */ 171 { &vop_open_desc, ptyfs_open }, /* open */ 172 { &vop_close_desc, ptyfs_close }, /* close */ 173 { &vop_access_desc, ptyfs_access }, /* access */ 174 { &vop_getattr_desc, ptyfs_getattr }, /* getattr */ 175 { &vop_setattr_desc, ptyfs_setattr }, /* setattr */ 176 { &vop_read_desc, ptyfs_read }, /* read */ 177 { &vop_write_desc, ptyfs_write }, /* write */ 178 { &vop_ioctl_desc, ptyfs_ioctl }, /* ioctl */ 179 { &vop_fcntl_desc, ptyfs_fcntl }, /* fcntl */ 180 { &vop_poll_desc, ptyfs_poll }, /* poll */ 181 { &vop_kqfilter_desc, ptyfs_kqfilter }, /* kqfilter */ 182 { &vop_revoke_desc, ptyfs_revoke }, /* revoke */ 183 { &vop_mmap_desc, ptyfs_mmap }, /* mmap */ 184 { &vop_fsync_desc, ptyfs_fsync }, /* fsync */ 185 { &vop_seek_desc, ptyfs_seek }, /* seek */ 186 { &vop_remove_desc, ptyfs_remove }, /* remove */ 187 { &vop_link_desc, ptyfs_link }, /* link */ 188 { &vop_rename_desc, ptyfs_rename }, /* rename */ 189 { &vop_mkdir_desc, ptyfs_mkdir }, /* mkdir */ 190 { &vop_rmdir_desc, ptyfs_rmdir }, /* rmdir */ 191 { &vop_symlink_desc, ptyfs_symlink }, /* symlink */ 192 { &vop_readdir_desc, ptyfs_readdir }, /* readdir */ 193 { &vop_readlink_desc, ptyfs_readlink }, /* readlink */ 194 { &vop_abortop_desc, ptyfs_abortop }, /* abortop */ 195 { &vop_inactive_desc, spec_inactive }, /* inactive */ 196 { &vop_reclaim_desc, ptyfs_reclaim }, /* reclaim */ 197 { &vop_lock_desc, ptyfs_lock }, /* lock */ 198 { &vop_unlock_desc, ptyfs_unlock }, /* unlock */ 199 { &vop_bmap_desc, ptyfs_bmap }, /* bmap */ 200 { &vop_strategy_desc, ptyfs_strategy }, /* strategy */ 201 { &vop_print_desc, ptyfs_print }, /* print */ 202 { &vop_islocked_desc, ptyfs_islocked }, /* islocked */ 203 { &vop_pathconf_desc, ptyfs_pathconf }, /* pathconf */ 204 { &vop_advlock_desc, ptyfs_advlock }, /* advlock */ 205 { &vop_bwrite_desc, ptyfs_bwrite }, /* bwrite */ 206 { &vop_putpages_desc, ptyfs_putpages }, /* putpages */ 207 { NULL, NULL } 208 }; 209 const struct vnodeopv_desc ptyfs_vnodeop_opv_desc = 210 { &ptyfs_vnodeop_p, ptyfs_vnodeop_entries }; 211 212 /* 213 * _reclaim is called when getnewvnode() 214 * wants to make use of an entry on the vnode 215 * free list. at this time the filesystem needs 216 * to free any private data and remove the node 217 * from any private lists. 218 */ 219 int 220 ptyfs_reclaim(void *v) 221 { 222 struct vop_reclaim_args /* { 223 struct vnode *a_vp; 224 } */ *ap = v; 225 return ptyfs_freevp(ap->a_vp); 226 } 227 228 /* 229 * Return POSIX pathconf information applicable to special devices. 230 */ 231 int 232 ptyfs_pathconf(void *v) 233 { 234 struct vop_pathconf_args /* { 235 struct vnode *a_vp; 236 int a_name; 237 register_t *a_retval; 238 } */ *ap = v; 239 240 switch (ap->a_name) { 241 case _PC_LINK_MAX: 242 *ap->a_retval = LINK_MAX; 243 return 0; 244 case _PC_MAX_CANON: 245 *ap->a_retval = MAX_CANON; 246 return 0; 247 case _PC_MAX_INPUT: 248 *ap->a_retval = MAX_INPUT; 249 return 0; 250 case _PC_PIPE_BUF: 251 *ap->a_retval = PIPE_BUF; 252 return 0; 253 case _PC_CHOWN_RESTRICTED: 254 *ap->a_retval = 1; 255 return 0; 256 case _PC_VDISABLE: 257 *ap->a_retval = _POSIX_VDISABLE; 258 return 0; 259 case _PC_SYNC_IO: 260 *ap->a_retval = 1; 261 return 0; 262 default: 263 return EINVAL; 264 } 265 } 266 267 /* 268 * _print is used for debugging. 269 * just print a readable description 270 * of (vp). 271 */ 272 int 273 ptyfs_print(void *v) 274 { 275 struct vop_print_args /* { 276 struct vnode *a_vp; 277 } */ *ap = v; 278 struct ptyfsnode *ptyfs = VTOPTYFS(ap->a_vp); 279 280 printf("tag VT_PTYFS, type %d, pty %d\n", 281 ptyfs->ptyfs_type, ptyfs->ptyfs_pty); 282 return 0; 283 } 284 285 /* 286 * Invent attributes for ptyfsnode (vp) and store 287 * them in (vap). 288 * Directories lengths are returned as zero since 289 * any real length would require the genuine size 290 * to be computed, and nothing cares anyway. 291 * 292 * this is relatively minimal for ptyfs. 293 */ 294 int 295 ptyfs_getattr(void *v) 296 { 297 struct vop_getattr_args /* { 298 struct vnode *a_vp; 299 struct vattr *a_vap; 300 kauth_cred_t a_cred; 301 struct lwp *a_l; 302 } */ *ap = v; 303 struct ptyfsnode *ptyfs = VTOPTYFS(ap->a_vp); 304 struct vattr *vap = ap->a_vap; 305 306 PTYFS_ITIMES(ptyfs, NULL, NULL, NULL); 307 308 /* start by zeroing out the attributes */ 309 VATTR_NULL(vap); 310 311 /* next do all the common fields */ 312 vap->va_type = ap->a_vp->v_type; 313 vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 314 vap->va_fileid = ptyfs->ptyfs_fileno; 315 vap->va_gen = 0; 316 vap->va_flags = 0; 317 vap->va_nlink = 1; 318 vap->va_blocksize = PAGE_SIZE; 319 320 vap->va_atime = ptyfs->ptyfs_atime; 321 vap->va_mtime = ptyfs->ptyfs_mtime; 322 vap->va_ctime = ptyfs->ptyfs_ctime; 323 vap->va_birthtime = ptyfs->ptyfs_birthtime; 324 vap->va_mode = ptyfs->ptyfs_mode; 325 vap->va_flags = ptyfs->ptyfs_flags; 326 vap->va_uid = ptyfs->ptyfs_uid; 327 vap->va_gid = ptyfs->ptyfs_gid; 328 329 switch (ptyfs->ptyfs_type) { 330 case PTYFSpts: 331 case PTYFSptc: 332 if (pty_isfree(ptyfs->ptyfs_pty, 1)) 333 return ENOENT; 334 vap->va_bytes = vap->va_size = 0; 335 vap->va_rdev = ap->a_vp->v_rdev; 336 break; 337 case PTYFSroot: 338 vap->va_rdev = 0; 339 vap->va_bytes = vap->va_size = DEV_BSIZE; 340 break; 341 342 default: 343 return EOPNOTSUPP; 344 } 345 346 return 0; 347 } 348 349 /*ARGSUSED*/ 350 int 351 ptyfs_setattr(void *v) 352 { 353 struct vop_setattr_args /* { 354 struct vnodeop_desc *a_desc; 355 struct vnode *a_vp; 356 struct vattr *a_vap; 357 kauth_cred_t a_cred; 358 struct lwp *a_l; 359 } */ *ap = v; 360 struct vnode *vp = ap->a_vp; 361 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 362 struct vattr *vap = ap->a_vap; 363 kauth_cred_t cred = ap->a_cred; 364 struct lwp *l = ap->a_l; 365 int error; 366 367 if (vap->va_size != VNOVAL) { 368 switch (ptyfs->ptyfs_type) { 369 case PTYFSroot: 370 return EISDIR; 371 case PTYFSpts: 372 case PTYFSptc: 373 break; 374 default: 375 return EINVAL; 376 } 377 } 378 379 if (vap->va_flags != VNOVAL) { 380 if (vp->v_mount->mnt_flag & MNT_RDONLY) 381 return EROFS; 382 if (kauth_cred_geteuid(cred) != ptyfs->ptyfs_uid && 383 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 384 NULL)) != 0) 385 return error; 386 /* Immutable and append-only flags are not supported on ptyfs. */ 387 if (vap->va_flags & (IMMUTABLE | APPEND)) 388 return EINVAL; 389 if (kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, NULL) == 0) { 390 /* Snapshot flag cannot be set or cleared */ 391 if ((vap->va_flags & SF_SNAPSHOT) != 392 (ptyfs->ptyfs_flags & SF_SNAPSHOT)) 393 return EPERM; 394 ptyfs->ptyfs_flags = vap->va_flags; 395 } else { 396 if ((ptyfs->ptyfs_flags & SF_SETTABLE) != 397 (vap->va_flags & SF_SETTABLE)) 398 return EPERM; 399 ptyfs->ptyfs_flags &= SF_SETTABLE; 400 ptyfs->ptyfs_flags |= (vap->va_flags & UF_SETTABLE); 401 } 402 ptyfs->ptyfs_flag |= PTYFS_CHANGE; 403 } 404 405 /* 406 * Go through the fields and update iff not VNOVAL. 407 */ 408 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 409 if (vp->v_mount->mnt_flag & MNT_RDONLY) 410 return EROFS; 411 if (ptyfs->ptyfs_type == PTYFSroot) 412 return EPERM; 413 error = ptyfs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 414 if (error) 415 return error; 416 } 417 418 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL || 419 vap->va_birthtime.tv_sec != VNOVAL) { 420 if (vp->v_mount->mnt_flag & MNT_RDONLY) 421 return EROFS; 422 if ((ptyfs->ptyfs_flags & SF_SNAPSHOT) != 0) 423 return EPERM; 424 if (kauth_cred_geteuid(cred) != ptyfs->ptyfs_uid && 425 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 426 NULL)) && 427 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 428 (error = VOP_ACCESS(vp, VWRITE, cred, l)) != 0)) 429 return (error); 430 if (vap->va_atime.tv_sec != VNOVAL) 431 if (!(vp->v_mount->mnt_flag & MNT_NOATIME)) 432 ptyfs->ptyfs_flag |= PTYFS_ACCESS; 433 if (vap->va_mtime.tv_sec != VNOVAL) 434 ptyfs->ptyfs_flag |= PTYFS_CHANGE | PTYFS_MODIFY; 435 if (vap->va_birthtime.tv_sec != VNOVAL) 436 ptyfs->ptyfs_birthtime = vap->va_birthtime; 437 ptyfs->ptyfs_flag |= PTYFS_CHANGE; 438 error = ptyfs_update(vp, &vap->va_atime, &vap->va_mtime, 0); 439 if (error) 440 return error; 441 } 442 if (vap->va_mode != (mode_t)VNOVAL) { 443 if (vp->v_mount->mnt_flag & MNT_RDONLY) 444 return EROFS; 445 if (ptyfs->ptyfs_type == PTYFSroot) 446 return EPERM; 447 if ((ptyfs->ptyfs_flags & SF_SNAPSHOT) != 0 && 448 (vap->va_mode & 449 (S_IXUSR|S_IWUSR|S_IXGRP|S_IWGRP|S_IXOTH|S_IWOTH))) 450 return EPERM; 451 error = ptyfs_chmod(vp, vap->va_mode, cred, l); 452 if (error) 453 return error; 454 } 455 VN_KNOTE(vp, NOTE_ATTRIB); 456 return 0; 457 } 458 459 /* 460 * Change the mode on a file. 461 * Inode must be locked before calling. 462 */ 463 static int 464 ptyfs_chmod(struct vnode *vp, mode_t mode, kauth_cred_t cred, struct lwp *l) 465 { 466 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 467 int error; 468 469 if (kauth_cred_geteuid(cred) != ptyfs->ptyfs_uid && 470 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 471 NULL)) != 0) 472 return error; 473 ptyfs->ptyfs_mode &= ~ALLPERMS; 474 ptyfs->ptyfs_mode |= (mode & ALLPERMS); 475 return 0; 476 } 477 478 /* 479 * Perform chown operation on inode ip; 480 * inode must be locked prior to call. 481 */ 482 static int 483 ptyfs_chown(struct vnode *vp, uid_t uid, gid_t gid, kauth_cred_t cred, 484 struct lwp *l) 485 { 486 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 487 int error, ismember = 0; 488 489 if (uid == (uid_t)VNOVAL) 490 uid = ptyfs->ptyfs_uid; 491 if (gid == (gid_t)VNOVAL) 492 gid = ptyfs->ptyfs_gid; 493 /* 494 * If we don't own the file, are trying to change the owner 495 * of the file, or are not a member of the target group, 496 * the caller's credentials must imply super-user privilege 497 * or the call fails. 498 */ 499 if ((kauth_cred_geteuid(cred) != ptyfs->ptyfs_uid || uid != ptyfs->ptyfs_uid || 500 (gid != ptyfs->ptyfs_gid && 501 !(kauth_cred_getegid(cred) == gid || 502 (kauth_cred_ismember_gid(cred, gid, &ismember) == 0 && ismember)))) && 503 ((error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 504 NULL)) != 0)) 505 return error; 506 507 ptyfs->ptyfs_gid = gid; 508 ptyfs->ptyfs_uid = uid; 509 return 0; 510 } 511 512 /* 513 * implement access checking. 514 * 515 * actually, the check for super-user is slightly 516 * broken since it will allow read access to write-only 517 * objects. this doesn't cause any particular trouble 518 * but does mean that the i/o entry points need to check 519 * that the operation really does make sense. 520 */ 521 int 522 ptyfs_access(void *v) 523 { 524 struct vop_access_args /* { 525 struct vnode *a_vp; 526 int a_mode; 527 kauth_cred_t a_cred; 528 struct lwp *a_l; 529 } */ *ap = v; 530 struct vattr va; 531 int error; 532 533 if ((error = VOP_GETATTR(ap->a_vp, &va, ap->a_cred, ap->a_l)) != 0) 534 return error; 535 536 return vaccess(va.va_type, va.va_mode, 537 va.va_uid, va.va_gid, ap->a_mode, ap->a_cred); 538 } 539 540 /* 541 * lookup. this is incredibly complicated in the 542 * general case, however for most pseudo-filesystems 543 * very little needs to be done. 544 * 545 * Locking isn't hard here, just poorly documented. 546 * 547 * If we're looking up ".", just vref the parent & return it. 548 * 549 * If we're looking up "..", unlock the parent, and lock "..". If everything 550 * went ok, try to re-lock the parent. We do this to prevent lock races. 551 * 552 * For anything else, get the needed node. 553 * 554 * We try to exit with the parent locked in error cases. 555 */ 556 int 557 ptyfs_lookup(void *v) 558 { 559 struct vop_lookup_args /* { 560 struct vnode * a_dvp; 561 struct vnode ** a_vpp; 562 struct componentname * a_cnp; 563 } */ *ap = v; 564 struct componentname *cnp = ap->a_cnp; 565 struct vnode **vpp = ap->a_vpp; 566 struct vnode *dvp = ap->a_dvp; 567 const char *pname = cnp->cn_nameptr; 568 struct ptyfsnode *ptyfs; 569 int pty, error; 570 571 *vpp = NULL; 572 573 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) 574 return EROFS; 575 576 if (cnp->cn_namelen == 1 && *pname == '.') { 577 *vpp = dvp; 578 VREF(dvp); 579 return 0; 580 } 581 582 ptyfs = VTOPTYFS(dvp); 583 switch (ptyfs->ptyfs_type) { 584 case PTYFSroot: 585 /* 586 * Shouldn't get here with .. in the root node. 587 */ 588 if (cnp->cn_flags & ISDOTDOT) 589 return EIO; 590 591 pty = atoi(pname, cnp->cn_namelen); 592 593 if (pty < 0 || pty >= npty || pty_isfree(pty, 1)) 594 break; 595 596 error = ptyfs_allocvp(dvp->v_mount, vpp, PTYFSpts, pty, 597 curlwp); 598 return error; 599 600 default: 601 return ENOTDIR; 602 } 603 604 return cnp->cn_nameiop == LOOKUP ? ENOENT : EROFS; 605 } 606 607 /* 608 * readdir returns directory entries from ptyfsnode (vp). 609 * 610 * the strategy here with ptyfs is to generate a single 611 * directory entry at a time (struct dirent) and then 612 * copy that out to userland using uiomove. a more efficent 613 * though more complex implementation, would try to minimize 614 * the number of calls to uiomove(). for ptyfs, this is 615 * hardly worth the added code complexity. 616 * 617 * this should just be done through read() 618 */ 619 int 620 ptyfs_readdir(void *v) 621 { 622 struct vop_readdir_args /* { 623 struct vnode *a_vp; 624 struct uio *a_uio; 625 kauth_cred_t a_cred; 626 int *a_eofflag; 627 off_t **a_cookies; 628 int *a_ncookies; 629 } */ *ap = v; 630 struct uio *uio = ap->a_uio; 631 struct dirent d; 632 struct ptyfsnode *ptyfs; 633 off_t i; 634 int error; 635 off_t *cookies = NULL; 636 int ncookies; 637 struct vnode *vp; 638 int nc = 0; 639 640 vp = ap->a_vp; 641 ptyfs = VTOPTYFS(vp); 642 643 if (uio->uio_resid < UIO_MX) 644 return EINVAL; 645 if (uio->uio_offset < 0) 646 return EINVAL; 647 648 error = 0; 649 i = uio->uio_offset; 650 (void)memset(&d, 0, sizeof(d)); 651 d.d_reclen = UIO_MX; 652 ncookies = uio->uio_resid / UIO_MX; 653 654 switch (ptyfs->ptyfs_type) { 655 case PTYFSroot: /* root */ 656 657 if (i >= npty) 658 return 0; 659 660 if (ap->a_ncookies) { 661 ncookies = min(ncookies, (npty + 2 - i)); 662 cookies = malloc(ncookies * sizeof (off_t), 663 M_TEMP, M_WAITOK); 664 *ap->a_cookies = cookies; 665 } 666 667 for (; i < 2; i++) { 668 switch (i) { 669 case 0: /* `.' */ 670 case 1: /* `..' */ 671 d.d_fileno = PTYFS_FILENO(0, PTYFSroot); 672 d.d_namlen = i + 1; 673 (void)memcpy(d.d_name, "..", d.d_namlen); 674 d.d_name[i + 1] = '\0'; 675 d.d_type = DT_DIR; 676 break; 677 } 678 if ((error = uiomove(&d, UIO_MX, uio)) != 0) 679 break; 680 if (cookies) 681 *cookies++ = i + 1; 682 nc++; 683 } 684 if (error) { 685 ncookies = nc; 686 break; 687 } 688 for (; uio->uio_resid >= UIO_MX && i < npty; i++) { 689 /* check for used ptys */ 690 if (pty_isfree(i - 2, 1)) 691 continue; 692 693 d.d_fileno = PTYFS_FILENO(i - 2, PTYFSpts); 694 d.d_namlen = snprintf(d.d_name, sizeof(d.d_name), 695 "%lld", (long long)(i - 2)); 696 d.d_type = DT_CHR; 697 if ((error = uiomove(&d, UIO_MX, uio)) != 0) 698 break; 699 if (cookies) 700 *cookies++ = i + 1; 701 nc++; 702 } 703 ncookies = nc; 704 break; 705 706 default: 707 error = ENOTDIR; 708 break; 709 } 710 711 if (ap->a_ncookies) { 712 if (error) { 713 if (cookies) 714 free(*ap->a_cookies, M_TEMP); 715 *ap->a_ncookies = 0; 716 *ap->a_cookies = NULL; 717 } else 718 *ap->a_ncookies = ncookies; 719 } 720 uio->uio_offset = i; 721 return error; 722 } 723 724 int 725 ptyfs_open(void *v) 726 { 727 struct vop_open_args /* { 728 struct vnode *a_vp; 729 int a_mode; 730 kauth_cred_t a_cred; 731 struct lwp *a_l; 732 } */ *ap = v; 733 struct vnode *vp = ap->a_vp; 734 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 735 736 ptyfs->ptyfs_flag |= PTYFS_CHANGE|PTYFS_ACCESS; 737 switch (ptyfs->ptyfs_type) { 738 case PTYFSpts: 739 case PTYFSptc: 740 return spec_open(v); 741 case PTYFSroot: 742 return 0; 743 default: 744 return EINVAL; 745 } 746 } 747 748 int 749 ptyfs_close(void *v) 750 { 751 struct vop_close_args /* { 752 struct vnode *a_vp; 753 int a_fflag; 754 kauth_cred_t a_cred; 755 struct lwp *a_l; 756 } */ *ap = v; 757 struct vnode *vp = ap->a_vp; 758 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 759 760 simple_lock(&vp->v_interlock); 761 if (vp->v_usecount > 1) 762 PTYFS_ITIMES(ptyfs, NULL, NULL, NULL); 763 simple_unlock(&vp->v_interlock); 764 765 switch (ptyfs->ptyfs_type) { 766 case PTYFSpts: 767 case PTYFSptc: 768 return spec_close(v); 769 case PTYFSroot: 770 return 0; 771 default: 772 return EINVAL; 773 } 774 } 775 776 int 777 ptyfs_read(void *v) 778 { 779 struct vop_read_args /* { 780 struct vnode *a_vp; 781 struct uio *a_uio; 782 int a_ioflag; 783 kauth_cred_t a_cred; 784 } */ *ap = v; 785 struct timespec ts; 786 struct vnode *vp = ap->a_vp; 787 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 788 int error; 789 790 ptyfs->ptyfs_flag |= PTYFS_ACCESS; 791 /* hardclock() resolution is good enough for ptyfs */ 792 getnanotime(&ts); 793 (void)ptyfs_update(vp, &ts, &ts, 0); 794 795 switch (ptyfs->ptyfs_type) { 796 case PTYFSpts: 797 VOP_UNLOCK(vp, 0); 798 error = (*pts_cdevsw.d_read)(vp->v_rdev, ap->a_uio, 799 ap->a_ioflag); 800 vn_lock(vp, LK_RETRY|LK_EXCLUSIVE); 801 return error; 802 case PTYFSptc: 803 VOP_UNLOCK(vp, 0); 804 error = (*ptc_cdevsw.d_read)(vp->v_rdev, ap->a_uio, 805 ap->a_ioflag); 806 vn_lock(vp, LK_RETRY|LK_EXCLUSIVE); 807 return error; 808 default: 809 return EOPNOTSUPP; 810 } 811 } 812 813 int 814 ptyfs_write(void *v) 815 { 816 struct vop_write_args /* { 817 struct vnode *a_vp; 818 struct uio *a_uio; 819 int a_ioflag; 820 kauth_cred_t a_cred; 821 } */ *ap = v; 822 struct timespec ts; 823 struct vnode *vp = ap->a_vp; 824 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 825 int error; 826 827 ptyfs->ptyfs_flag |= PTYFS_MODIFY; 828 getnanotime(&ts); 829 (void)ptyfs_update(vp, &ts, &ts, 0); 830 831 switch (ptyfs->ptyfs_type) { 832 case PTYFSpts: 833 VOP_UNLOCK(vp, 0); 834 error = (*pts_cdevsw.d_write)(vp->v_rdev, ap->a_uio, 835 ap->a_ioflag); 836 vn_lock(vp, LK_RETRY|LK_EXCLUSIVE); 837 return error; 838 case PTYFSptc: 839 VOP_UNLOCK(vp, 0); 840 error = (*ptc_cdevsw.d_write)(vp->v_rdev, ap->a_uio, 841 ap->a_ioflag); 842 vn_lock(vp, LK_RETRY|LK_EXCLUSIVE); 843 return error; 844 default: 845 return EOPNOTSUPP; 846 } 847 } 848 849 int 850 ptyfs_ioctl(void *v) 851 { 852 struct vop_ioctl_args /* { 853 struct vnode *a_vp; 854 u_long a_command; 855 void *a_data; 856 int a_fflag; 857 kauth_cred_t a_cred; 858 struct lwp *a_l; 859 } */ *ap = v; 860 struct vnode *vp = ap->a_vp; 861 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 862 863 switch (ptyfs->ptyfs_type) { 864 case PTYFSpts: 865 return (*pts_cdevsw.d_ioctl)(vp->v_rdev, ap->a_command, 866 ap->a_data, ap->a_fflag, ap->a_l); 867 case PTYFSptc: 868 return (*ptc_cdevsw.d_ioctl)(vp->v_rdev, ap->a_command, 869 ap->a_data, ap->a_fflag, ap->a_l); 870 default: 871 return EOPNOTSUPP; 872 } 873 } 874 875 int 876 ptyfs_poll(void *v) 877 { 878 struct vop_poll_args /* { 879 struct vnode *a_vp; 880 int a_events; 881 struct lwp *a_l; 882 } */ *ap = v; 883 struct vnode *vp = ap->a_vp; 884 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 885 886 switch (ptyfs->ptyfs_type) { 887 case PTYFSpts: 888 return (*pts_cdevsw.d_poll)(vp->v_rdev, ap->a_events, ap->a_l); 889 case PTYFSptc: 890 return (*ptc_cdevsw.d_poll)(vp->v_rdev, ap->a_events, ap->a_l); 891 default: 892 return genfs_poll(v); 893 } 894 } 895 896 int 897 ptyfs_kqfilter(void *v) 898 { 899 struct vop_kqfilter_args /* { 900 struct vnode *a_vp; 901 struct knote *a_kn; 902 } */ *ap = v; 903 struct vnode *vp = ap->a_vp; 904 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 905 906 switch (ptyfs->ptyfs_type) { 907 case PTYFSpts: 908 return (*pts_cdevsw.d_kqfilter)(vp->v_rdev, ap->a_kn); 909 case PTYFSptc: 910 return (*ptc_cdevsw.d_kqfilter)(vp->v_rdev, ap->a_kn); 911 default: 912 return genfs_kqfilter(v); 913 } 914 } 915 916 static int 917 ptyfs_update(struct vnode *vp, const struct timespec *acc, 918 const struct timespec *mod, int flags) 919 { 920 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 921 922 if (vp->v_mount->mnt_flag & MNT_RDONLY) 923 return 0; 924 925 PTYFS_ITIMES(ptyfs, acc, mod, NULL); 926 return 0; 927 } 928 929 void 930 ptyfs_itimes(struct ptyfsnode *ptyfs, const struct timespec *acc, 931 const struct timespec *mod, const struct timespec *cre) 932 { 933 struct timespec now; 934 935 KASSERT(ptyfs->ptyfs_flag & (PTYFS_ACCESS|PTYFS_CHANGE|PTYFS_MODIFY)); 936 937 getnanotime(&now); 938 if (ptyfs->ptyfs_flag & PTYFS_ACCESS) { 939 if (acc == NULL) 940 acc = &now; 941 ptyfs->ptyfs_atime = *acc; 942 } 943 if (ptyfs->ptyfs_flag & PTYFS_MODIFY) { 944 if (mod == NULL) 945 mod = &now; 946 ptyfs->ptyfs_mtime = *mod; 947 } 948 if (ptyfs->ptyfs_flag & PTYFS_CHANGE) { 949 if (cre == NULL) 950 cre = &now; 951 ptyfs->ptyfs_ctime = *cre; 952 } 953 ptyfs->ptyfs_flag &= ~(PTYFS_ACCESS|PTYFS_CHANGE|PTYFS_MODIFY); 954 } 955 956 /* 957 * convert decimal ascii to int 958 */ 959 static int 960 atoi(const char *b, size_t len) 961 { 962 int p = 0; 963 964 while (len--) { 965 char c = *b++; 966 if (c < '0' || c > '9') 967 return -1; 968 p = 10 * p + (c - '0'); 969 } 970 971 return p; 972 } 973
Indexes created Fri Sep 26 08:10:20 GMT 2025